1985/01/01 Caterpillar


Governor Flyweight Shield No Longer Used In New Scroll Fuel Systems

Usage:


3406B Truck Engines (7FB)

3406B Truck Engines that are equipped with new scroll fuel systems are no longer equipped with governor flyweight shields. Field reports have indicated that the shield can loosen from the flyweight carrier and come into contact with the flyweights and rack control linkages. The purpose of the flyweight shield was to keep any excess oil in the governor housing from splashing against the flyweights. Tests have proven that excess oil does not normally build up in the housing. The flyweight shield was discontinued on production machines, and a field rework program announced.

IDENTIFICATION

Many engines have already been reworked. Check the serial number of your engine. If it is in the 7FB1-7FB06809 range, the flyweight shield may not have been removed yet. If you have an engine with an affected serial number and you are not sure if the flyweight shield has been removed, contact the closest Caterpillar dealer. He will inspect the governor housing and quickly tell you if the flyweight shield has been removed. If the flyweight shield has not been removed, a convenient time can be scheduled by the dealer to have this done. The rework takes approximately three hours to complete.

Caterpillar Information System:

1985/01/01 Minimize Fuel Problems In Cold Weather Operation
1984/12/17 Remanufactured Turbocharger Groups
1984/12/17 Important Differences In Engine Arrangements On 3208 Engines Equipped With Turbochargers
1984/12/17 Bonnet Of Fuel Injection Pump Group Now Serviced Separately
1984/12/17 New Pressure Gauges Have Dual Scales [kPa (psi)]
1984/12/17 Thread Identification Kit Available
1984/12/17 Starters That Remain Engaged After Engine Is Running
1984/12/17 Causes And Correction Of Opposite Crankshaft Rotation In Direct Injection Engines
1984/12/17 Remanufactured Cylinder Head Groups
1984/12/17 Identification Of Camshaft Groups And Valve Mechanism Groups
1984/11/07 New Diaphragm Used In BrakeSaver Control Valve Group
1984/11/07 New High Alloy Material Is Used In Cylinder Head Assemblies
1985/01/01 New Truck Battery Is Available
1985/01/01 New Rear Crankshaft Seal Has Longer Service Life
1985/01/01 Contact Warranty Manager For Vibration Complaints On Western Star Trucks
1985/01/01 New And Improved Gaskets In Front Housing Group And Accessory Drive Group
1985/01/01 Remanufactured Air Fuel Ratio Controls (U.S. And Canada)
1985/01/01 New Tools Available To Service Fuel Injection Nozzles And Adapters
1985/01/01 Valve Lash Adjustment Not A Warranty Item
1985/01/01 Improved BrakeSaver Seals Available
1985/01/01 Additions To Reference Chart For Major Production Changes
1985/01/01 New Service Tools Available
1985/01/01 Exhaust Brake Performance Increased
1985/01/01 List of Service Publications
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